Art of molding steel castings.



entrain snares Parana JAMES C. DAVIS, HITISIDALE, ILLINOIS, ASSIGNGZR TOAMERICAN STEEL .EOTIINDRJIES, OF NEW YORK, N. '55., A CORPORATION OF NEWJERSEY.

ARE. SF MOLDING: STEEL OAS'EITNGS.

Rio Drawing.

To all whom it may concern:

Be it known that 1, Lucas 0. DAVIS a citizen of the United States, andresident of Hinsdale, in the county ofDupage and State of Illinois, haveinvented certain new and useful Improvements in the Art of Molding SteelCastings, of Which the following is a specification.

My invention relates to the art of casting and has particular referenceto a novel method of hardening or modifying the face of steel castings.

I am aware that it is a common practice after a mold has been formed toapply a coating or wash to the face thereof, such coating or Washconsisting of a carbon-containing mineral, sand and a binder. Thispractice has been followed inmoldlng steel castings but the resultingproduct, while having the required hardened exterior, is

unsightly and altogether too rough for ordinary use. This conditionarose from the combustion of the carbon element thus giving o'li a gaswhich in its escape prevented the metal from lying naturally against theface of the mold.

I have conceived of a method of casting whereby I am enabled to securethe desired results as to exterior hardness and at the same time producea casting which is smooth and sightly. A satisfactory substance is foundto be a mixture of a carbonaceous material such as 80% form-manganese,silica moiding sand and linseed oil, the elements being combined insubstantially the follouw ing proportions: lbs. term-manganese, lb.molding sand, g, pint linseed oil. These materials when thoroughly mixedform a plastic'substance which I apply to.

the pattern. in the mold; this is covered with the ordinary backing sandand the entire,

Specification of Letters Patent.

Patented Dec. as,

Application filed March 22, 1915. Serial 1Y0. 16,2053.

mold is then rammed with sand in the al manner after which tin.- patternis drawn and the mold dried as in ordinary dry sand mold practice. Afterthe metal is cast in a mold, such as described, the carbons. ceousmaterial i probably ignited as heretofore but the use of the silica.molding sand serves to create voidsor interstices for the escape of thegases with the result that the face of the casting"is smooth.

The exact proportions set forth are not requisite and may be varied toa. certain ere tent in order to carry out the method here disclosed.

It Will be understood that the linseed oil acts solely as a binder andthat only such quantity need be used as is necessary to bind theparticles of sand and carbonaceous material together and retain theimprint of the pattern after the rcinoya mold.

I claim: I 1. The method of preparing molds Wl'llfihconsists in the formof a compound con hereof from the taining carbonaceous material, moldingsand.

c'rrecfion in' Letters Patent No 1,265,651.

I It is hereby certified that in Lettem Patent N 0. l,165,651,gra11 todDecember 28, 1515, ilpon th'copplicafion of James G. Davis, of Hinsdalc,Illinois, for an impfovo- 'ment in The Art; of Molding Steel Castings,an verror appears in the printed spcification requiring correction asfollows: Claim 1 line 2, (line 65 of pagc,) for the word formrecdforming; and that the said iletiers Patent chould be read with thiscorrection thereinlhat the some may conform to tho record of the casein'the Patent Oifice.

Signed and sealed this 18th day of January, A1 D., 1916.

Wu J. m. NEWTON.

